Container-Optimized OS
TMA-COS-5.3.2
Ensure system accounts are secured
Описание
There are a number of accounts provided with most distributions that are used to manage applications and are not intended to provide an interactive shell. It is important to make sure that accounts that are not being used by regular users are prevented from being used to provide an interactive shell. By default, most distributions set the password field for these accounts to an invalid string, but it is also recommended that the shell field in the password file be set to the nologin shell. This prevents the account from potentially being used to run any commands.
Как проверяется
Метод проверки: Команда оболочки
min=$(awk '/^[[:space:]]*UID_MIN/{print $2}' /etc/login.defs); min=${min:-1000}; shells=$(awk -F/ '/^\// && $NF != "nologin"' /etc/shells); bad=0; while IFS=: read -r u p uid g c h sh; do for x in root sync shutdown halt; do [ "$u" = "$x" ] && continue 2; done; case $u in +*) continue;; esac; [ "$uid" -lt "$min" ] 2>/dev/null || continue; printf "%s\n" "$shells" | grep -qxF -- "$sh" && bad=1; done < /etc/passwd; [ $bad -eq 0 ] && echo compliant || echo noncompliant- Ожидаемый вывод
compliant
Как исправляется
Метод исправления: Рекомендация или патч инфраструктуры
Run the commands appropriate for your distribution: Set the shell for any accounts returned by the audit to nologin: # usermod -s $(which nologin) <user> Lock any non root accounts returned by the audit: # usermod -L <user> The following command will set all system accounts to a non login shell: awk -F: '($1!="root" && $1!="sync" && $1!="shutdown" && $1!="halt" && $1!~/^\+/ && $3>='"$(awk '/^\s*SYS_UID_MIN/{print $2}' /etc/login.defs)"' && $3<='"$(awk '/^\s*SYS_UID_MAX/{print $2}' /etc/login.defs)"' && $7!="'"$(which nologin)"'" && $7!="/bin/false") {print $1}' /etc/passwd | while read user; do usermod -s $(which nologin) $user; done The following command will automatically lock not root system accounts: awk -F: '($1!="root" && $1!~/^\+/ && $3>='"$(awk '/^\s*SYS_UID_MIN/{print $2}' /etc/login.defs)"' && $3<='"$(awk '/^\s*SYS_UID_MAX/{print $2}' /etc/login.defs)"') {print $1}' /etc/passwd | xargs -I '{}' passwd -S '{}' | awk '($2!="L" && $2!="LK") {print $1}' | while read user; do usermod -L $user; done
Свойства
- Операционные системы
- Любая
- Теги
- container-optimized-oscos
- Источник
- CIS Google Container-Optimized OS Benchmark v1.2.0 - 5.3.2 Ensure system accounts are secured
Проверить этот хост
Выполните команду на компьютере, аудит которого вам разрешён. Сканирование работает только на чтение.
tmaegis scan --target cos --level 2